Method for preparing butyraldehyde from propylene and synthesis gas

A synthesis gas and propylene technology, applied in carbon monoxide reaction preparation, chemical recovery, organic chemistry, etc., can solve the problems of low conversion rate and production capacity of the second reactor, short catalyst service life, high production cost, etc.

Active Publication Date: 2012-01-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that there are problems in the prior art that the conversion rate and production capacity of the second reac

Method used

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  • Method for preparing butyraldehyde from propylene and synthesis gas
  • Method for preparing butyraldehyde from propylene and synthesis gas
  • Method for preparing butyraldehyde from propylene and synthesis gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] according to figure 2 In the process shown, the stream I containing propylene, synthesis gas and catalyst enters the first reactor 1. After the reaction, the vapor phase stream II is obtained at the top of the tower, and the liquid phase stream III is obtained at the bottom of the tower. Stream III enters the intermediate separation unit 3, and after separation, stream IV containing propylene and butyraldehyde, stream V containing catalyst and butyraldehyde, and crude butyraldehyde product stream VI are obtained; stream VI enters the subsequent process. Stream II, stream IV, stream V and make-up synthesis gas 4 enter the second reactor, and after the reaction, stream VII containing butyraldehyde and tail gas 5 are obtained, and tail gas 5 is discharged outside.

[0026] The operating conditions of the first reactor are: pressure 1900KPa, temperature 90°C, residence time 3 hours. The weight ratio of propylene, synthesis gas and catalyst in stream I is 1:0.57:0.29. The...

Embodiment 2

[0039] The flow process is the same as [Example 1], but the operation mode is different. Increased feed, continuous use of intermediate separation units. In this way, the production capacity can be increased and the potential of the subsequent separation device can be fully tapped without changing the structure of the reactor or the subsequent main equipment. For existing installations, the use of the present invention is very advantageous. In the case of adding a little equipment, the capacity can be expanded by up to 10%.

[0040] The reaction result is: the conversion rate of the first reactor is 65%, and the conversion rate of the second reactor is 83%. See Table 4 and Table 5 for details.

[0041] Table 4

[0042]

[0043] table 5

[0044]

[0045] Under the premise of not changing the structure, size and size of the two reactors, the production capacity of the reaction unit is increased by 10%. Nascent butyraldehyde increased from 395kmol / h to 435kmol / h. If ...

Embodiment 3

[0047] according to image 3 In the process shown, the stream I containing propylene, synthesis gas and catalyst enters the first reactor 1. After the reaction, the vapor phase stream II is obtained at the top of the tower, and the liquid phase stream III is obtained at the bottom of the tower. Stream III enters the intermediate separation unit 3, and after separation, stream IV containing propylene and butyraldehyde, stream V containing catalyst and butyraldehyde, and crude butyraldehyde product stream VI are obtained; stream VI enters the subsequent process. Stream II, stream IV, stream V and make-up synthesis gas 4 enter the second reactor, and after the reaction, stream VII containing butyraldehyde and tail gas 5 are obtained, and tail gas 5 is discharged outside. The stream VI and the stream VII enter the separation unit 7, and the synthesis gas is used as the stripping gas to obtain the vapor phase stream VIII containing propylene and the synthesis gas, the liquid phase ...

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Abstract

The invention relates to a method for preparing butyraldehyde from propylene and synthesis gas, and mainly solves the problems that a second reactor has low conversion rate and capacity and a catalyst has short life cycle and high production cost in the prior art. The method comprises the following steps of: a) allowing material flow I containing propylene, synthesis gas and a catalyst to enter a first reactor I, and reacting to obtain vapor phase material flow II on the tower top and liquid phase material flow III on the tower bottom; b) allowing the material flow III to enter a middle separation unit 3, separating to obtain material flow IV containing propylene and butyraldehyde, material flow V containing a catalyst and butyraldehyde, a crude butyraldehyde product material flow VI, and allowing the material flow VI to enter a subsequent process; and c) allowing the material flow II, the material flow IV, the material flow V and make-up synthesis gas to enter a second reactor, and reacting to obtain material flow VII containing butyraldehyde and tail gas 5. The method better solves the problems and can be applied to industrial production of preparing butyraldehyde from propylene and synthesis gas.

Description

technical field [0001] The invention relates to a method for preparing butyraldehyde from propylene and synthesis gas. Background technique [0002] Butyraldehyde is an important organic chemical raw material. At present, it is mainly produced industrially from propylene, carbon monoxide and hydrogen through oxo synthesis. The literature "Simulation Research on Propylene Carbonylation Process for Butyraldehyde Synthesis, Natural Gas Chemical Industry, 2009(34): 20-24" discloses a process flow for preparing butyraldehyde by carbonylation of propylene and synthesis gas. In this process, propylene and syngas are used as raw materials, which pass through two series-connected reactors in sequence to obtain the product butyraldehyde. Then the product enters the downstream separation section. Through two evaporations, propylene and catalyst are recycled as much as possible. Part of the butyraldehyde is recycled as a reaction solvent, and part of it is sent to the downstream butano...

Claims

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Application Information

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IPC IPC(8): C07C47/02C07C45/50
CPCY02P20/584
Inventor 印立峰陈迎李真泽刘祎婷
Owner CHINA PETROLEUM & CHEM CORP
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